Rare earth permanent magnets represent the largest application of rare earth elements by value. Their production creates strong demand for neodymium and praseodymium, while cerium and lanthanum occur in much larger proportions in many light rare earth resources. Because rare earth elements occur together in mineral deposits, they cannot be mined and separated only in the proportions required by downstream markets.
This creates the rare earth balance problem. Producing enough neodymium and praseodymium for the permanent magnet industry inevitably results in the simultaneous production of larger quantities of cerium and lanthanum. This issue is particularly relevant to China’s light rare earth resources, whose natural composition contains substantially more cerium and lanthanum than neodymium and praseodymium.
Cerium is already used in polishing materials, catalysts, glass, alloys, and other products. However, these markets do not provide a similarly high-value and rapidly growing outlet capable of fully absorbing its large supply. Cerium therefore tends to remain in structural surplus and is generally priced far below PrNd, with relatively limited price fluctuations.
